Unusual Isotope Effects of Molybdenum in Chemical Exchange Reaction Using Dicyclohexano-18-Crown-6

1999 ◽  
Vol 72 (6) ◽  
pp. 1219-1223 ◽  
Author(s):  
Toshiyuki Fujii ◽  
Jun Inagawa ◽  
Kazushige Nishizawa
Keyword(s):  
Exchange Reaction ◽  
Chemical Exchange ◽  
Isotope Effects

scholarly journals Concentration of N15by Chemical Exchange Reaction Method

1951 ◽  
Vol 24 (3) ◽  
pp. 153-155 ◽  
Author(s):  
Asao Sugimoto ◽  
Ryohei Nakane ◽  
Tsunao Watanabe
Keyword(s):  
Exchange Reaction ◽  
Chemical Exchange ◽  
Reaction Method

A CONCENTRATION OF N15BY A CHEMICAL EXCHANGE REACTION

1937 ◽  
Vol 59 (7) ◽  
pp. 1407-1408 ◽  
Author(s):  
H. C. Urey ◽  
Marvin Fox ◽  
J. R. Huffman ◽  
H. G. Thode
Keyword(s):  
Exchange Reaction ◽  
Chemical Exchange

Synthesis of Further Substrates of NAD(P)-Linked Dehydrogenases of High Specific Tritium Content

1975 ◽  
Vol 30 (3-4) ◽  
pp. 141-146 ◽  
Author(s):  
Miguel Alizade ◽  
Helmut Simon ◽  
Rubin Bressler ◽  
Klaus Brendel
Keyword(s):  
Exchange Reaction ◽  
Isotope Effects ◽  
Specific Radioactivity ◽  
Hydrogen Ions ◽  
Tritium Content

Abstract Stereospecific, Hydrogen Labeled The preparation of (R) and (S) [2-3H] lactate as well as (S) [2-3H] glutam ate via the coupled exchange reaction catalyzed by NAD linked dehydrogenases and NADH : lipoam ide oxidoreductase (diaphorase) is described. The specific radioactivity of the hydrogen ions of the 3HOH /H2O can be obtained in the substrates (100% exchange) if equilibrium isotope effects are disregarded. By the exchange procedure substrates w ith higher specific radioactivity are obtained from positionally [3H] labeled racem ic m ixtures prepared by chemical reductions with [3H] labeled hydrides. The tritium content of one of the enantiom eres is “washed out” into water. As examples are presented the preparation of (R) [2-3H] (S) [2-H] malate as well as the corresponding carnitine, glutam ate and (R) and (S) lactate.

scholarly journals Chemical Exchange Reaction Effect on Polarization Transfer Efficiency in SLIC-SABRE

2018 ◽  
Vol 122 (46) ◽  
pp. 9107-9114 ◽  
Author(s):  
Andrey N. Pravdivtsev ◽  
Ivan V. Skovpin ◽  
Alexandra I. Svyatova ◽  
Nikita V. Chukanov ◽  
Larisa M. Kovtunova ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Chemical Exchange ◽  
Polarization Transfer ◽  
Transfer Efficiency

Contributions of Nuclear Size and Shape, Nuclear Mass, and Nuclear Spin to Enrichment Factors of Zinc Isotopes in a Chemical Exchange Reaction by a Cryptand

1998 ◽  
Vol 33 (14) ◽  
pp. 2101-2112 ◽  
Author(s):  
Kazushige Nishizawa ◽  
Yoshihisa Maeda ◽  
Fumiyoshi Kawashiro ◽  
Toshiyuki Fujii ◽  
Tadashi Yamamoto ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Nuclear Spin ◽  
Chemical Exchange ◽  
Enrichment Factors ◽  
Nuclear Size ◽  
Nuclear Mass ◽  
Size And Shape ◽  
Zinc Isotopes

Unequal primary kinetic isotope effects in the base-catalysed H–D exchange of diastereotopic protons

1980 ◽  
Vol 58 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Robert R. Fraser ◽  
Philippe J. Champagne
Keyword(s):  
Transition State ◽  
Exchange Reaction ◽  
Isotope Effect ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Deuterium Isotope Effect ◽  
Kinetic Isotope

Primary kinetic isotope effects have been measured for the base-catalyzed exchange reaction of 4′,1″-dimethyl-1,2,3,4-dibenzcyclohepta-1,3-diene-6-one, 1. It was found that the isotope effects kH/kT and kD/kT for the faster exchanging protons (13.6 and 3.8 respectively) are significantly larger than the corresponding values for the slower exchanging protons (4.6 and 1.6 respectively). These differences could result from truly unequal isotope effects due to transition state differences or intrusion of a second pathway for exchange of the less reactive proton in the dedeuteration reaction. The data appear to support the latter interpretation. The secondary deuterium isotope effect was found to be 1.18.

Tunneling chemical exchange reaction D + HD → D2 + H in solid HD and D2 at temperatures below 1 K

2016 ◽  
Vol 18 (42) ◽  
pp. 29600-29606 ◽  
Author(s):  
S. Sheludiakov ◽  
J. Ahokas ◽  
J. Järvinen ◽  
D. Zvezdov ◽  
L. Lehtonen ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Isotopic Exchange ◽  
Chemical Exchange ◽  
Temperature Range ◽  
Isotopic Exchange Reaction ◽  
Solid Hd

The rates of the isotopic exchange reaction D + HD → D2 + H were measured in solid HD and D2:0.23%HD in a temperature range of 0.13–1.5 K.

Chemical Exchange Reaction of Glycinatocopper(II) Complex in Water: A Theoretical Study

2005 ◽  
Vol 109 (45) ◽  
pp. 10403-10409 ◽  
Author(s):  
Tatsuya Hattori ◽  
Takashi Toraishi ◽  
Takao Tsuneda ◽  
Shinya Nagasaki ◽  
Satoru Tanaka
Keyword(s):  
Exchange Reaction ◽  
Theoretical Study ◽  
Chemical Exchange
Sign in / Sign up

Export Citation Format

Share Document